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Journal of Applied Physics : Vacancy generation during Cu diffusion in GaAs

By M. Elsayed, V. Bondarenko, K. Petters, J. Gebauer, and R. Krause-Rehberg

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Book Id: WPLBN0002169366
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 20 November 2008

Title: Journal of Applied Physics : Vacancy generation during Cu diffusion in GaAs  
Author: M. Elsayed, V. Bondarenko, K. Petters, J. Gebauer, and R. Krause-Rehberg
Volume: Issue : November 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection, Journal of Applied Physics Collection
Historic
Publication Date:
Publisher: American Institute of Physics

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V. Bondarenko, K. Petters, J. Gebauer, And R. Krause-Rehber, M. E. (n.d.). Journal of Applied Physics : Vacancy generation during Cu diffusion in GaAs. Retrieved from http://community.ebooklibrary.org/


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Description: Positron lifetime and Doppler broadening spectroscopy were applied for a study of defect properties of semi-insulating GaAs after diffusion of copper. A 30 nm layer of Cu was deposited by evaporation to the undoped GaAs samples. The diffusion of Cu was performed during an annealing step at 1100 °C at different arsenic vapor pressures. The samples were quenched into room temperature water. The initial semi-insulating (SI) undoped GaAs sample shows no positron traps. After annealing, a vacancy-type complex and a shallow positron trap were observed to be efficient positron traps. Due to the Cu contamination during the annealing process, the shallow trap is believed to be the CuGa double acceptor. The nature of the vacancy-type defects could not be determined unambiguously. The concentration of these vacancies shows inverse relationship to the As vapor pressure that refers to the arsenic vacancy as a part of this complex. Moreover, Doppler-coincidence spectroscopy shows clearly that Cu atoms are not bound in the direct vicinity to the observed vacancies.

 

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